package dao

import (
	"errors"
	"github.com/redis/go-redis/v9"
)

var ErrNotExists = errors.New("not exists")

// PostalDao persistent postal group api
type PostalDao interface {
	LoadGroupIdsByUid(uid string) ([]string, error)
	GroupCreate(gid string) (string, error)
	GroupJoin(gid, uid string) error
	GroupLeave(gid, uid string) error
	GroupDismiss(gid string) error
}

type RedisPostalDao struct {
	rdb *redis.Client
}

func (d *RedisPostalDao) LoadGroupIdsByUid(uid string) (gids []string, err error) {
	return
}